1969 David Brown 990

bdubs634 · Sep 14, 2017

I just bought a '69 990 selectomatic and the 3 pt arms go up as soon as you start the machine. If I push on them I can get them to go down, and if I hook up my brush hog they will go down but don't seem to operate quite right they are very jumpy. Also if I go up hill and rev the engine in a lower gear the brush hog will raise up until the engine revs back down. The tractor runs great I just need to figure out the 3pt issues. Thank you in advance...

MJ in the UK · Sep 15, 2017

I think you have got the swtch for the different hydraulic functions in the TCU
position instead of the HEIGHT position witch is in the middle position. MJ

bdubs634 · Sep 15, 2017

this may be a stupid question but I'm new to David Brown tractors but is the TCU the knob that's below the controls for the 3 pt arms??

joestewart · Sep 15, 2017

Open up this pdf and go to page 12. There will be an illustration of the selector dial with the TCU setting on it. Turn to page 15 for details on how to operate.

https://drive.google.com/file/d/0B9-7bn5CX9NDSTltQ3kxTGpuaGs/view
David Brown 990 operators manual

Bret4207 · Sep 16, 2017

Do what Joe Stewart said. Then either print the manual out of get a hard copy. You also will want to find and bookmark the David Brown tractor club site. They have lots of info and experience with the DB's. You have a great tractor, you just need to learn how to use it.

bdubs634 · Sep 16, 2017

Awesome thank you guys I hope to try it tomorrow

bdubs634 · Sep 18, 2017

Ok I changed the selector switch and now it won't let me lower the brush hog all the way to the ground.. what should I try next

Bret4207 · Sep 19, 2017

There are 3 positions on the selector. I don't recall which one lets the arms go to the lowest position. I think it's with the switch pointing "up". There is another position where the arms only go 3/4 of the way down.

Did you get the manual and read it?

Bret4207 · Sep 19, 2017

Also, when you move the selector, you have to hold the 3 pt lever all the way to the rear so it can switch, should hear a "click" when you do that.

bdubs634 · Sep 19, 2017

I did read the manual that was posted I have a hard copy ordered to make it a little easier to get through.. I'm thinking that I may still have it in the wrong position I have it in the "height" position which is in the middle. I will be out at the my land in the next couple days and I will try it again.

1969 David Brown 990

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